It looks like Miley Cyrus and Liam Hemsworth have been hooking up for much longer than we thought.

It looks like Miley Cyrus and Liam Hemsworth have been hooking up for much longer than we thought.

According to TMZ, the former love birds have been secretly hanging out since as far back as last September.

The pair, who were spotted "kissing" in Byron Bay last week, have been reportedly in almost constant communication and never stopped loving each other, despite ending their engagement over two years ago.

Things are said to have escalated well past the friend zone over the past few weeks, with other sources claiming they're both keen on getting back together.

"Miley came back to LA on Monday after spending the holidays with Liam," an insider told Us Weekly. "She had the time of her life being with him and his family.

"She feels like they could pick up right where they left off. Miley has never gotten over Liam and always hoped they would get back together. She doesn't know where it will go, but she definitely still loves him and wants to be with him. Liam has an interest in being back together too."

Meanwhile, Liam, 25, admitted to Men's Fitness magazine back in October that he will always be in love with the singer.

"You fall in love with who you fall in love with. You can never choose," he told the magazine. "I mean, look - we were together five years, so I don't think those feelings will ever change.

"And that's good because that proves to me that it was real. It wasn't just a fling. It really was an important part of my life and always will be."

Since their split in September 2013, Miley, 23, has dated Patrick Schwarzenegger, and was briefly linked to Victoria's Secret model Stella Maxwell.